LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free →

FANUC Alarm HOST-166 — WARN EXMG: Write Pending

FANUC HOST-166 (“WARN EXMG: Write Pending”): Attempt to read before write. First check: A write should precede read.

Updated 2026-09-17 · LogrobotLM reference

Description

Attempt to read before write.

Remedy

A write should precede read.

Related codes

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →